First slide

Magnetic flux and induced emf

Question

A motor having an armature of resistance $2 Ω$ is designed to operate at 220 V mains. At full speed, it develops a back e.m.f. of 210V. When the motor is running at full speed, the current in the armature is

Moderate

A

5A
B

105A
C

110A
D

215A

Solution

$i = \frac{E - e}{R} = \frac{220 - 210}{2} = \frac{10}{2} = 5 A$

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